--  @testpoint:opengauss关键字call(非保留)，作为函数名
--关键字不带引号-成功
drop function if exists call;
create function call(i integer)
returns integer
as $$
begin
    return i+1;
end;
$$ language plpgsql;
/
--清理环境
drop function call;

--关键字带双引号-成功
drop function if exists "call";
create function "call"(i integer)
returns integer
as $$
begin
    return i+1;
end;
$$ language plpgsql;
/
--清理环境
drop function "call";

--关键字带单引号-合理报错
drop function if exists 'call';
create function 'call'(i integer)
returns integer
as $$
begin
    return i+1;
end;
$$ language plpgsql;
/

--关键字带反引号-合理报错
drop function if exists `call`;
create function `call`(i integer)
returns integer
as $$
begin
    return i+1;
end;
$$ language plpgsql;
/